Recorder for electrical measuring instruments.



' a citizen of the -United States, residing at arrangement presents continuously to'view To all whowiic't may concern:

UNITED 1 sTArEs CHARLES B. THWING, vF PHILADELPHIA, PENNSYLVANIA.

RECORDER FOR ELECTRICAL MEASURING INSTRUMENTS.

Be' it known `that L'CHARLES B.y THWING,

Philadelphia, inthe county of Philadelphia and State of Pennsylvania, have invented a new and useful Improvement in Recorders tor Electrical h'leasuring lnstruments,- of which the following isa specification.

My invention relates yto an improvement inrecorders forrecording the readings of galvanometers and other electrical measuring instruments, and is designed especially for use f with electrical pyrometers,l the form shownl and described being designed for use with thermo-electric couples.

- I will -now describe my invention so that others skilled in the art may manufacture und use the same, reference being had to the accompanying drawing, forming part of this specification, in whichh y Figure l is a top plan view of my iniproved recorder. Fig. 2 is a side elevation of the same. Figs 3- and 4 are detail views of the contacts. Fig` 5 is a diagrammatic view showing also a modification .whereby the readings of -two instruments may be shown in different manner on the recording sheet.

Like symbols of reference indicate like parts in each.

In the drawings, 1 represents a galvanometer,'prefeiably ofthe type shown in my Patent No. 870,803, the'pointer 2 of which carries at its outeroextremity a metal point 3,

which. when inked in the manner hereinafter described, is depressed upon a moving sheet 4 making a series ot dots or marks tervals'ofp-time to which the instrument is adjusted. The record sheet 11 is carried forward at a uniform rate of speed ona drum 5, to which it is attached by sliding the sheet into a slot 6 in the drum. A metal binding clamp 7 retains the sheet onthe drum against the pull of the weight -8 clamped to it for the purpose lof keeping it taut. .This

all that portion of the sheet upon which a record has been made; VThe ldrinn is driven b v a. gear-wheel 9. actuated by the gearwheel 10 of asuitahle clock-work mechanism 11, which also actuates the printing mechanism and the mechanism for opening and specification of Letters Patent.

Application filed June 29,

Patented June 1, 1909.

1908.* Serial No. 440,844.

' closing the electrical circuit or circuits in the manner hereinafter set forth.

'12 is a bail mounted on and adapted to 'follow the movements of a shaft 13 supported bystandards 14, the said shaft being bent downwardly to' form a counterpoise 15 for the bail and a stop 1G to limit the downward increment of the 'counterpoise and in consequence the upward movement of the bail. i l

17 is a. gear-wheel actuated by the clockwork mechanism, and 18 lis a weighted lever adapted normally to restupon and depress the counterpoise 15. 'lhe lever 18 is provided with a dog 18, adapted t-o be moved by the teeth of the gear-wheel 17.

l19 is a standard having mounted thereon and suitably insulated therefrom contact posts 20, 2]. provided with spring-actuated contactsl 20, 21. 92 is a third contact post Vmounted on the standard 19, and provided with 'a contact 22 which is alwaysheld by means of the spring 22 against. a metallic gear-wheel 28, through which .the various circuits are made as hereinafter explained. The contact 22 is always in circuit with the galvanometer.

The drum 5 is attached -to a sleeve '24, which vis made fast to a shaft 25 by a screwclutch Q6, so that the drum may be released and rotated when a new record sheet is inserted and set in correct position to bring the proper hour mark at the side of the sheet under the pointer.

The lead-s from the thermo-electric couple A are connected to the contact-posts ai and e, a: being in turn` connected to the contact 20 and 'e to the galvanometer. The leads from the thermo-electric couple B are connected to the contact-posts y and a, contact-post y 'being connected to the contact post 19. Y

The operation of my improved recorder is as follows -In the position shown in Fig. 2' the spring-contact 21 is shown as resting upon and contacting with one ofthe teeth of the contactavheel Q3. The current then passes from the couple B to the binding post y, tothe contact 21, through the contactwheel 23 to the Contact 22', from there to the galvanometer, and vto the binding-post e .and back to the couple B. Current thus passing through the galvanometer coil, theneedle or pointerQ thereof will be swung to the proper position over the record sheet. Just at this moment one of the teeth of the gear-wheel v17 wiii depress thedog 18', thus raisiiigythe lever 18 which will release the cofnnterpoise and the bail- 12 will by reason of its own weight descend upon the-pointer 2, vcausing the point or printer 3 theref to make a dot on the sheet et, making'. the proper record -for .the couple B.' When the dog 1.8 is released from engagement with the said tooth vof the Wheel 17, it Will fall back into the space following said. tooth, andthe lever 18 Will de'- scend lagainst the counterpoise l5 and raise the bail l2 from the pointer. Just about this time the tooth on the contact-Wheel' 23 v will pass fr'om under the contact 21 and the .made contact with the *springv contact ,rod v20', and' the circuit of the couple A is comother taken alone;

pleted, the current passing from A to binding post a", to contact 20l to contact-Wheel 23,'to contact 22, to the galvanoin'eter, and backto the couple A through the binding post e common to both couples. When the circuit of the couple A is thus closed, the pointer'2 andv its 'printer 3 are again depressed in the manner before described andv .another dot lis made' on the sheet 4, making the proper record'for the couple A'. In this manner the recordsfor the two couples are constantlyand regularly made on the sheet and may be seen at a glance at any time.

It will lbe apparent -of course that one couple may dbe cut out and the record of th y To-preventn confusion von the sheet when the record of a plurality of couples is being made, it may be found desirable to differentiate between the form of the two records on thek sheet. This may be done, by placing another contact 2()a in such close proximity 'to the`contact'20) and connected to the saine wire) that the contact-WheelI 23 will make and break contact therewith before contact- 4ing with thecontact'21. 'Thiswill cause the pointer to make two closely-adjacent dots for the record of the `couple A, andv individual separated dots for the couple B, thusv readily distinguishing the 'records of the two ,v `couples.-

The advantages of my invention will be lreadily appreciated by those skilled in the. art. he device is simple in character, inexpensive to manufacture and maintain, and does not readily get out of order.

1.'v In an.automatic recorder, the combination .of means vfor .imparting regular mo- 'tion toa .recording sheet, an lelectrical measuring instrument, a deflect-able .indicator operated by said instrument and carry-` ling printing mechanism, inking means located at one side ofthe recording sheet, means for openingand closing the electrical circuit through' the instrument,l Vand means Ywhen the circuit is open for bringing the printing mechanism in contact with the inking means and when'the circuit is closed for bringing 'the printing mechanism against said recording sheet.

- 2. In an automatic vrecorder, thecombination of mechanism for imparting regulary motion to a recording surface, an electrical tion of mechanismvfor imparting regular motion to a recording surface, an electrical measuringdnstruiiient, a deectable indicator operated Lbysaid, measuring instrument and carrying a printing` device, inking means, contacts in circuit with the nieasuring instrument, a contact-wheel operated by said mechanism for opening and closing the circuit through said contacts, andv means ing the* printing device against the inlring means when thev circuit is open and against the-recording surface when the circuit is closed.

4. In an automatic recorder, the combination =of mechanism for imparting regular ,'motionto a recording surface, an electrical `measuring instrument, a deectable indica-- tor operated by` said measuring instrument' and carrying a printing device, inking -also operated by said mechanism for inov-' means, contacts in circuit'with vthe measuring instrument, 'a contact-Wheel operated by saidmechanism foropening and closing the circuit through said contacts, a bail located. over the indicator and normally' tending when permittedto depress the printing device against the inking means cr against the recording surface, and a lever operated by said mechanism for raising said bail out of contact lwith the indicator.

In an automatic recorder, the combination of clock-work mechanism for imparting regular motion to a recording" surface, a galva-nometer in a plurality of electric4 circuits, a deflectable indicator arm operatedby the galvaiiometer and carrying a' rinting device, inking means, contacts incircillt electrical "circuits, a contact-wheel operated by said clock-work mechanism for opening and closing jsaid .circuits alternately through said contacts, and means also operated y said clock-work mechanism for movingv thev printing 'device against the inking means when either circuit is opened and against the recording surface when either circuit is closed;

6. In an automatic recorder, the combination of clock-work mechanism for impart! circuits, a deectable indicator arm operated by the galvanonieter and carrying a printing device, inking means, contacts in circuit with the galvanoineter and the plurali-ty of electric circuits, a contact-wheel operated by said clock-work mechanism by means of which one circuit is opened and closed through said contacts a greater number of times than the other, and means also operated 'by said clock-work mechanism for moving the printing device against the inking means when either circuit is opened and against the recording surface when either circuit -is closed, whereby distinguishable recording surface'. A

In testimony whereof I have hereunto set my hand.

v CHARLES B. THWING. Witnesses:

GEO. A. Bass, A. B. AMES.

'records'of the two circuits are made on the 

